#ifndef MD5_H
#define MD5_H

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

static const uint32_t s[] = {7,  12, 17, 22, 7,  12, 17, 22, 7,  12, 17, 22, 7,
                             12, 17, 22, 5,  9,  14, 20, 5,  9,  14, 20, 5,  9,
                             14, 20, 5,  9,  14, 20, 4,  11, 16, 23, 4,  11, 16,
                             23, 4,  11, 16, 23, 4,  11, 16, 23, 6,  10, 15, 21,
                             6,  10, 15, 21, 6,  10, 15, 21, 6,  10, 15, 21};

static const uint32_t K[] = {
    // floor(2^32 × abs(sin(i + 1)))
    0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a,
    0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
    0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340,
    0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
    0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
    0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
    0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa,
    0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
    0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
    0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
    0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391};

#define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (32 - (c))))

void md5(const uint8_t *initial_msg, size_t len, uint8_t digest[16]);

#endif // MD5_H
